Air Compressor 4946291 For Engine B3.9 B4.5 B5.9 ISBE QSB4.5 QSB6.7 ISF2.8

Keywords: 4946291 air compressor, B3.9 engine air pump, QSB6.7 air compressor assembly, ISBE engine air brake compressor, truck construction machinery air compressor, diesel engine air spare parts, aftermarket air compressor

🔹Product Overview

Air Compressor Part No.4946291 is core air‑supply component for diesel engine air brake system, compatible with B3.9, B4.5, B5.9, ISBE, QSB4.5, QSB6.7, ISF2.8 engine. Driven by engine gear, it compresses air and delivers pressurized air to air tank, supplying stable compressed air for vehicle braking, pneumatic control system. This replacement air compressor resolves typical faults including insufficient air pressure output, slow air‑charging speed, oil mixing in air circuit, abnormal mechanical noise and air leakage caused by internal wear, piston and valve plate damage. Manufactured strictly to OEM specifications for direct replacement.

🔹Detailed Specifications

🔹Key Features & Advantages

• OEM‑consistent gear size, mounting flange, oil‑gas port position, direct bolt‑on installation without modification.
• Precision‑matched piston and valve plate assembly, stable air‑charging efficiency, fast build‑up of system air pressure.
• Good sealing structure, effectively prevent engine oil from entering air circuit.
• Wear‑resistant internal moving parts, adapt to long‑duration heavy‑duty working conditions.
• Strict factory pressure & leak test, every air compressor passes performance inspection before leaving factory.
• Excellent interchangeability, suitable for engine overhaul and on‑site emergency maintenance.

🔹Application Scope ‑

Fit Equipment: Machinery & trucks powered by B3.9, B4.5, B5.9, ISBE, QSB4.5, QSB6.7, ISF2.8 diesel engine ‑ Widely used for machinery repair workshops, vehicle fleet maintenance and engine pneumatic system overhaul projects.

🔹Our Company Advantage

We are professional supplier of full‑range construction machinery spare parts, supplying hydraulic parts, engine parts, electrical parts, seal kits and complete overhaul kits. ‑ Large ready stock for various machinery spare parts ‑ Factory‑direct wholesale competitive price ‑ Mixed‑order & one‑stop spare‑parts procurement supported ‑ Professional part‑number matching technical support service

🔹Packaging & Shipping ‑

Anti‑collision inner package, protect parts during transportation ‑ Export‑grade outer carton for safe sea and land transportation ‑ Multiple shipping options: sea freight, air freight, international express for small trial orders ‑ Export documents such as Commercial Invoice, Packing List can be provided.

🔹Contact Us

If you need more excavator spare parts or other construction machinery replacement components, please send your parts list to us. We will offer our best quotation for you quickly.